ASM-2 Manual Appendix A
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- Gyles Greer
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1 ASM-2 Manual Appendix A Assembly Guidelines June 30 th, 2005 Please note that this document is still currently under revision and we apologise for any errors or omissions. Readers should feel free to any comments to me at the address given below. 1 of 1
2 Assembly Instructions Included with your ASM-2 pcb is a large drawing which is a blow-up of the silkscreen showing the location for each component as per the various schematics. Builders should use this in conjunction with both the schematics and the Bills Of Materials provided on the Support CDROM, to determine which component goes where. Builders should also read the other documentation provided on this CDROM and also follow the web links to other constructors for additional ideas and notes on constructing your ASM-2. When assembling the board we recommend one of the following two strategies:- 1) Assembly of the full board by component type. In this method the board is built up in layers starting with resistors and diodes, then ICs, capacitors, trimpots and transistors. One disadvantage of this approach is that the unit cannot be tested until the complete board has been assembled. I use a PCB Assembly Jig (see photograph) which means that I can insert components and solder them without having too bend the legs over to retain them. This is a big bonus if you wish to experiment with the board as it makes component removal a lot easier. 2) Assembly by module. In this method each module is assembled in its entirety one at a time. Once assembled, the module can be tested with, in many, cases minimal external componentry being added. One disadvantage of this method is that you will need to connect some external components to some of the modules for testing and this will require some connecting and disconnecting to allow for easy assembly of the next stage. This approach does not work with my PCB Assembly Jig and the previous method as the variations in component heights affects the height of the components on the board preventing the component retainer from working properly. Option (2) may suit users with less confidence in their assembly skills as they can quickly determine if a module works properly and as to how things are going. Once you have figured out what components you want to stuff, mark up the drawings to show this. Occasionally some components may become obsolete or very difficult to get hold of. In these instances, substitute components are provided. Wherever possible, these will be pin compatible (as well as functionally compatible) allowing them to be inserted in to the PCB without modifications. However, this is not always possible and some components may need to have their legs bent to fit the PCB location. We are continually on the lookout for alternative substitutes and will replace components in our kits as approved substitutes become available. 2 of 2
3 General notes on the assembly of the ASM-2 PCB: All resistors on the PCB are on a 0.4 pitch whilst most diodes are on a 0.3 pitch and so these components can be generally preformed before insertion in to the pcb. Capacitors in the range 1nF to 1uF are normally on a 0.2 pitch whilst smaller capacitors are either 0.2 pitch (generally ceramics) or 0.4 pitch (polystyrene). Tantalums and electrolytics are generally on a 0.2 pitch. A resistor colour code chart is on the CD included with your kit. Integrated Circuits (IC) may be socketed if desired (a kit of sockets is available) but is not required in normal use. If you wish to experiment with the modules then we recommend the use of IC sockets. If used, we strongly recommend using machine-turned-pin sockets as these offer better long-term use. Wiring to the boards is made easier by having all of the module connections at the edges of the PCB. We recommend running your cables around the outside of the boards in a loom leaving the centre of the board clear. This will be a boon when setting up and adjusting the modules and will also simplify debugging should it be needed. This will result in slightly longer cable runs but this should not adversely affect the quality of the system through induced noise. Colour coding of cables is not a pre-requisite but once again using colour-coded cables will simplify tracing faults. The table below gives two examples of suggested colour schemes:- Cable Colour Function Or Cable Colour Function Red +15V Red Black Ground Black Yellow -15V Yellow Orange Control Voltages - In Orange VCO* Pink Control Voltages Out Blue ADSR Green VCA* Grey Signals In* Brown VCF* White Signals Out* Grey NOISE* White LFO Pink GLIDE * Audio signals are better wired using screened audio cable. The first scheme on the left will have the advantage of allowing you to bulk buy a handful of cable colours but will make fault finding a little harder. The second scheme, on the right, will require smaller quantities of more cable colours but will allow you to trace wires for a given module more easily. I would recommend this second approach for beginners. For the choice of wire type and sizes I would suggest:- 7/0.2mm (24AWG 7/32AWG) for control wires 16/0.2mm (22AWG 7/30AWG) for power rails (NB: 7/0.2mm is also fine for this purpose Single-core screened audio cable for all signal wires 3 of 3
4 When selecting audio cable, choose the smallest outside diameter possible. I use 10/0.12mm with an OD of 1.6mm. Larger cable OD will result in a larger cable loom. When connecting screened cable you should only connect one end of the screen to GND. In the ASM1-Genie this GND connection was provided by running a length of tinned copper wire around the outside of the pcb. This was achieved by placing eyelets on each corner of the pcb (using the pcb fixing holes to support the eyelets) and then attaching the wire to the free end of the eyelets. This approach means that the screen terminations are evenly spread around the board making it easier to maintain the wiring. The free end of the screen is cut flush with the end of the outer sleeve of the cable and either shrouded with a piece of heatshrink or masked by teasing the outer sleeve over the exposed wire. Nowadays its is recommended that you treat all semiconductor parts as static-sensitive, especially the CA3140s (that s why they get soldered in last). Be really careful with these they are unbelievably easy to blow up. You can, optionally, use ic-sockets for the IC s if you want. It is recommended to use sockets for the CD4002 and LM358 chips in the ADSRs, and for the output buffer op-amps in the VCF. Also, you may want to socket the CA3140s in the VCOs since they are so easy to blow up. Component Substitutions and Your Own Modifications: If you know what you re doing, go for it. If not, stick with the recommended parts. TEMPCO s: The ASM kits include a TEMPCO resistor for each of the VCO s. A TEMPCO can also be used in the VCF but is not included in the kit as this is less critical. The ASM kits provide a 1% metal film resistor for the VCF. The pcb has positions for the TEMPCO on the pcb but builders are referred to the photo which shows one method for improving the thermal bonding between the TEMPCO and the MAT-02. In this approach the TEMPCO is actually placed directly underneath the MAT-02. Thermal contact is improved through the application of some heatsink compound. The current design of the VCO modules requires TEMPCOs with a Positive Temperature Coefficient (PTC) of 3300ppm. Your VCO module kits will contain one of the following configurations for this component:- 1. A 3300ppm resistor. In this case resistors R137 and R187 should be replaced with a wire link 2. A 3500ppm resistor. In this case your kit will also include 2 off 62R 50ppm resistors which should be fitted in positions R137 and R187 Thermal contact: All of the critical exponential converter components are physically placed next to each other so that they can be in physical contact. The transistors and the TEMPCO resistors (if used) should, ideally, be thermally bonded together with heatsink compound, for best thermal results. This is totally optional and only for those who are after perfect performance. 4 of 4
5 Bills of Materials (BOMs): The following pages provide the BOMs for the ASM-2 and are provided as:- 1. A BOM for the overall pcb to assist when purchasing your kit, and 2. BOMs for each individual module to assist with identification of components during construction. These BOMs should be used in conjunction with the schematics and component overlay. Components are given 3 or 4 digit identifiers such as C301, R221 and Q1201. The first of these three digits (two in the case of 4-digit numbers) relates to the schematic sheet number on which the component can be found whilst the last 2-digits are a sequence number for that component category on the sheet. When building your own order for components you should note the following points:- 1. All resistors are 1% 0.5W Metal Film (MRS25 Series). In most cases these can be replaced by lower tolerance (up to 10%) resistors. Also in most cases you can also use Carbon Film. 2. Capacitors in the range 1nF and 1000nF are generally Polyester (BF or MKS2 Series). Substitutes should be of a low-noise, high-stability type. 3. Capacitors below 1nF are generally 2.5% 160VDC Polystyrene (FCS Series) but Silvered Mica will also work fine. In some cases it is possible too use a high-stability NPO Multilayer Ceramic capacitor. 4. Decoupling capacitors are listed as 100nF X7R Multilayer Ceramics. Values in the range of 47nF to 150nF can be freely used in these positions and any good quality capacitor that will fit the RAD-0.2 footprint can be used. 5. Capacitors of 1uF and above are polarised and should either be MDT or TAP Series Tantalum or low-impedance Aluminium Electrolytics. Some schematics include panel-mounted components. Where shown, these components are required for the proper operation of the circuit. These components are NOT included in ASM2 kit. Additionally, some schematics include some control voltage input controls. These controls are, again, not included in our kits but have been included to show nominal component values and wiring details to assist the user in building/designing their modules. The values shown are similar to those that are being used in the ASMx-Genie and, as such, will be made available in kits when the ASMx-Genie is released. 5 of 5
6 Bills Of Materials for the ASM-2 The following pages list the Bill Of Materials for the complete ASM-2 pcb and should be used when purchasing the parts for your build. These BOMs do NOT include any components that are external to the ASM-2 pcb such as pots and switches. If not already done, then readers are advised to read Appendix B and look at the ASM1-Genie and ASM2-Genie for suggestions regards completing your ASM-2 design. You can configure your pcb as an ASM-1 by simply omitting the relevant components. All ASM-2 enhancements are in ADDITION to the original ASM-1 and so, other than being a slightly larger pcb, you can reproduce an ASM-1 without modifications to the pcb. 6 of 6
7 Bill of Material for ASM-2 Part 1 RESISTORS 2 10R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor R 0.5W 1% Metal Film Resistor K 0.5W 1% Metal Film Resistor 273-1K 4 1K2 0.5W 1% Metal Film Resistor K 11 1K5 0.5W 1% Metal Film Resistor K 1 1K8 0.5W 1% Metal Film Resistor K 1 2K 0.5W 1% Metal Film Resistor 273-2K 7 2K2 0.5W 1% Metal Film Resistor K 1 2K4 0.5W 1% Metal Film Resistor K 6 2K7 0.5W 1% Metal Film Resistor K 6 3K 0.5W 1% Metal Film Resistor 273-3K 3 3K3 0.5W 1% Metal Film Resistor K 2 3K9 0.5W 1% Metal Film Resistor K 1 4K7 0.5W 1% Metal Film Resistor K 2 5K6 0.5W 1% Metal Film Resistor K 5 6K8 0.5W 1% Metal Film Resistor K 25 10K 0.5W 1% Metal Film Resistor K 4 12K 0.5W 1% Metal Film Resistor K 10 15K 0.5W 1% Metal Film Resistor K 3 18K 0.5W 1% Metal Film Resistor K 3 20K 0.5W 1% Metal Film Resistor K 4 22K 0.5W 1% Metal Film Resistor K 1 27K 0.5W 1% Metal Film Resistor K 1 33K 0.5W 1% Metal Film Resistor K 1 39K 0.5W 1% Metal Film Resistor K 11 47K 0.5W 1% Metal Film Resistor K 1 51K 0.5W 1% Metal Film Resistor K 2 56K 0.5W 1% Metal Film Resistor K 9 68K 0.5W 1% Metal Film Resistor K 4 75K 0.5W 1% Metal Film Resistor K 2 91K 0.5W 1% Metal Film Resistor K K 0.5W 1% Metal Film Resistor K 1 150K 0.5W 1% Metal Film Resistor K 3 200K 0.5W 1% Metal Film Resistor K 1 270K 0.5W 1% Metal Film Resistor K 2 300K 0.5W 1% Metal Film Resistor K 2 330K 0.5W 1% Metal Film Resistor K 2 390K 0.5W 1% Metal Film Resistor K 2 430K 0.5W 1% Metal Film Resistor K 6 560K 0.5W 1% Metal Film Resistor K 13 1M 0.5W 1% Metal Film Resistor 273-1M 2 1M2 0.5W 1% Metal Film Resistor M 2 1M5 0.5W 1% Metal Film Resistor M 3 2M2 0.5W 1% Metal Film Resistor M POTENTIOMETERS 1 100R 25T Spectrol 64W Multiturn Trimpot W R 25T Spectrol 64W Multiturn Trimpot W R 25T Spectrol 64W Multiturn Trimpot W K 25T Spectrol 64W Multiturn Trimpot W101 7 of 7
8 6 10K 25T Spectrol 64W Multiturn Trimpot W K 25T Spectrol 64W Multiturn W K 25T Spectrol 64W Multiturn W504 SPECIAL RESISTORS 2 62R 50ppm 50ppm 1% Metal Film Resistor N/A 2 1K 3500ppm 1000R 3500ppm/C N/A 8 of 8
9 Bill of Material for ASM-2 Part 3 POLYSTYRENE CAPACITORS 4 10pF 2.5% 100VDC Polystyrene N/A 2 22pF 2.5% 100VDC Polystyrene N/A 2 33pF 2.5% 100VDC Polystyrene N/A 2 100pF 2.5% 100VDC Polystyrene 23PS pF 2.5% 100VDC Polystyrene 23PS pF 2.5% 100VDC Polystyrene 23PS224 POLYESTER CAPACITORS 2 1nF 63V 10% Metallised Polyester 75MKT n2 63V 10% Metallised Polyester 75MKT n6 63V 10% Metallised Polyester 2 8n2 63V 10% Metallised Polyester 6 10nF 63V 10% Metallised Polyester 75MKT nF 63V 10% Metallised Polyester 75MKT nF 63V 10% Metallised Polyester 75MKT nF Ceramic Multilayer Ceramic 50V X7R 80-C412C104K5R 2 120nF 63V 10% Metallised Polyester 2 220nF 63V 10% Metallised Polyester 75MKT nF 63V 10% Metallised Polyester 75MKT nF 63V 10% Metallised Polyester 75MKT nF 63V 10% Metallised Polyester 75MKT TANTALUM AND ELECTROLYTIC CAPACITORS 2 1uF 16V 20% MDT 16V Resin-dipped Tantalum 581-TAP105K016SCS 2 1uF 25V 20% MDT 25V Resin-dipped Tantalum 581-TAP105K025SCS 1 2u2 35V 20% 35V Radial Aluminium Electrolytic 647-UVP1H2R2MDA 3 4u7 25V 20% MDT 16V Resin-dipped Tantalum 581-TAP475K025SCS 3 10uF 16V 20% MDT 16V Resin-dipped Tantalum 581-TAP106K016SCS 1 100uF 16V 20% 16V Radial Aluminium Electrolytic 647-UVP1H101MPA 1 220uF 16V 20% 16V Radial Aluminium Electrolytic 647-UVP1H221MPA 2 470uF 25V 20% 25V Radial Aluminium Electrolytic 647-UVP1H471MPA 9 of 9
10 Bill of Material for ASM-2 Part 4 SEMICONDUCTORS 2 1N4001 1A 50V Power Diode 512-1N N4148 Signal Diode 333-1N N3904 NPN Transistor 511-2N N3906 PNP Transistor 511-2N Dual 4-input NOR Gate BM Triple 2-Channel Analog Mux/Demux BM terminal +15V Voltage Regulator 512-KA terminal 15V Voltage Regulator 512-KA Hex Schmitt Triggers BC549C NPN Transistor 512-BC549 2 CA NPN General-purpose Transistors N/A 4 CA3080 Operational Transconductance Amplifier N/A 6 CA MHz Wide-bandwith Op-amp 570-CA3140E 3 J108 Fast-switched FET N/A 2 LF412 Dual BI-FET low-power Op-amp 595-LF412CP 2 LM311 Comparator 595-LM311D 1 LM317LZ 3-terminal Adjustable Regulator 511-LM317LZ 3 LM329 6V9 Precision Reference N/A 1 LM337LZ 3-terminal Adjustable Regulator 511-LM337LZ 4 LM358 Low-power Dual Op-amp 512-LM358AN 1 LM1458 Dual Op-amp 1 LM1496 Balanced Modulator/Demodulator N/A 2 MAT02 Dual-matched NPN Transistors N/A 4 OA91 Germanium Signal Diode N/A 5 TL081 Low-noise JFET Op-amp 511-TL081CN 7 TL082 Dual Low-noise JFET Op-amp 511-TL082CN 7 TL084 Quad Low-noise JFET Op-amp 511-TL084CN 2 TL074 Quad Low-noise JFET Op-amp 511-TL074CN 10 of 10
11 Bill of Material for ASM-2 Part 5 HARDWARE 2 M3 Locknut M3 Locknut or nut and washer 2 M3 x 8mm Bolt M3 Stainless-steel bolt 2 TO-220 Heatsink 9 Deg C/W Heatsink Vertical B00 The following items are NOT included in the ASM-2 Component Kit HARDWARE 1 300mA 4-way 0.2 connector 32 8-pin DIP IC Socket pin DIP IC Socket 2 16-pin DIP IC Socket 6 CON2 2-way 0.1 connector 30 CON3 3-way 0.1 connector 8 CON4 4-way 0.1 connector 2 CON5 5-way 0.1 connector (2-way + 3-way) 3 CON6 6-way 0.1 connector 1 CON8 8-way 0.1 connector 3 Peripheral Power 4-way 0.1 connector 11 of 11
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